About this app

What if you could get a second number in minutes, without the hassle of using a second phone or a second SIM card, but just by downloading an app? You dreamed of it, Onoff made it happen!

Download the Onoff app and get a second number in an instant!

You will want to use a second number for:

Having a separate professional line - separate your professional and personal life

Protecting your privacy when you are online - your safety is our priority

Selling goods online in total confidence - safely communicating with your potential buyers

Carrying only one phone on you - less weight in your pocket, less hassle between switching the phones

Being able to use your phone number from any smartphone and even from your web browser - we want you to have a number as flexible as your email!

Make low-cost international calls - the world is just one call away


With Onoff, you also have:

Unlimited calls and SMS
Integrated visual voicemail
Voice messages
Synchronization of all your contacts list
Possibility of porting an existing number, in order to use it in the Onoff App
An app compatible with all SIM cards to always call on the best network
Numbers from more than 30 countries available


And there’s much more!

You can follow us on:

Facebook - Linkedin - Twitter - Instagram

Do not hesitate to share your feedback and comments at support@onoffapp.com

Have a nice day with Onoff.


In the application, you can subscribe to a number or a calling plan, the prices of which vary depending on the nationality or region chosen, as well as the duration (1, 3 or 12 months). Payment will be made through your Google account after confirmation of purchase, and will be withdrawn 24 hours before the end of each billing cycle. You can deactivate automatic renewal in the settings of the Google Play after purchase, at least 24 hours before the end of the current subscription period. With your Onoff number, you can make unlimited calls throughout Europe. For communication outside of Europe, you can also purchase credits, valid for any destination!

We cannot guarantee the systematic compatibility of numbers with verification services by SMS.

New features

Calls are much more advanced than ever! We improved our ongoing call screen to provide better experience.
Onoff Call contact logic is improved, your phonebook will be more organised than ever.
We are constantly working on the keep our calls’ quality best. Now, you can send reports to us incase if you experience a bad call quality. So we can fix as soon as possible.
As always we also made some performance improvements and minor bug fixes.

App Permissions

Allows applications to access information about networks.
Allows using PowerManager WakeLocks to keep processor from sleeping or screen from dimming.
Allows access to the list of accounts in the Accounts Service.
Allows applications to read the sync settings.
Allows applications to write the sync settings.
Allows applications to open network sockets.
Allows read only access to phone state, including the phone number of the device, current cellular network information, the status of any ongoing calls, and a list of any PhoneAccounts registered on the device.
Allows an application to write to external storage.
Allows an application to read from external storage.
Allows an application to read the user's contacts data.
Allows an application to write the user's contacts data.
Allows modification of the telephony state - power on, mmi, etc.
Allows an application to record audio.
Allows an application to initiate a phone call without going through the Dialer user interface for the user to confirm the call.
Allows access to the vibrator.
Allows an app to create windows using the type TYPE_APPLICATION_OVERLAY, shown on top of all other apps.
Required to be able to access the camera device.
Allows an application to collect component usage statistics
Declaring the permission implies intention to use the API and the user of the device can grant permission through the Settings application.
Allows applications to access information about Wi-Fi networks.
Allows an application to modify global audio settings.
Allows applications to disable the keyguard if it is not secure.
Allows an app to access approximate location.
Permission an application must hold in order to use ACTION_REQUEST_IGNORE_BATTERY_OPTIMIZATIONS.
Marker permission for applications that wish to access notification policy.
Allows a calling application which manages it own calls through the self-managed ConnectionService APIs.
Allows applications to perform I/O operations over NFC.
Allows an application to receive the ACTION_BOOT_COMPLETED that is broadcast after the system finishes booting.
Allows an application to change the Z-order of tasks.
Allows applications to enter Wi-Fi Multicast mode.
Allows applications to connect to paired bluetooth devices.